feat: add Xbox One HID report layout and mapping

Phase 4 foundation, independent of the presentation mechanism:

- hid/hid_report.hpp: standard Xbox One report layout (64-byte input:
  buttons/guide/triggers/sticks; 64-byte output: motors), the HID
  report descriptor, and GIP state to report mapping.
- make_input_report(): remaps GIP button bits to the standard Xbox
  bitmask, scales 10-bit triggers to 8-bit, sticks pass through.
- parse_output_report(): extracts motor intensities from output
  reports for the rumble relay; malformed reports stop the motors.
- test_hid: unit tests for the mapping, scaling, and descriptor.

Report packing verified with a descriptor walker: input and output
are exactly 64 bytes each. Next step is presentation via DriverKit,
which needs a Developer ID with the DriverKit entitlement.

Co-Authored-By: qwen3.8-27b@q3_k_xl: implemented HID report layer

tests/CMakeLists.txt

@@ -50,6 +50,13 @@ target_compile_features(test_gip PRIVATE cxx_std_23)
 add_test(NAME test_gip COMMAND test_gip)
 list(APPEND TEST_TARGETS test_gip)
 
+add_executable(test_hid test_hid.cpp)
+target_include_directories(test_hid PRIVATE "${CMAKE_SOURCE_DIR}/include")
+target_link_libraries(test_hid PRIVATE xone_hid Unity::Unity)
+target_compile_features(test_hid PRIVATE cxx_std_23)
+add_test(NAME test_hid COMMAND test_hid)
+list(APPEND TEST_TARGETS test_hid)
+
 add_custom_target(check
     COMMAND ${CMAKE_CTEST_COMMAND}
             --test-dir "${CMAKE_BINARY_DIR}"